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Diodes Incorporated ZLLS400TC
- Part No.:
- ZLLS400TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
ZLLS400TC.pdf
- Description:
- DIODE SCHOTTKY 40V 520MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,243
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Product details
Overview
ZLLS400TC from Diodes Incorporated is a 40V, 0.52A surface-mount Schottky barrier diode in SOD323 package, featuring 0.5V max forward voltage at 400mA, 10µA max reverse leakage at 30V, and thermally rated to +150°C - deployed in DC-DC converters for high-efficiency power conversion under elevated ambient temperatures.
For engineers reviewing the ZLLS400TC datasheet, ZLLS400TC pinout, ZLLS400TC application, or ZLLS400TC equivalent, key selection criteria include low VF performance at high current (≤500mV @ 400mA), ultra-low IR (≤10µA @ 30V), thermal robustness (+150°C TJ), and SOD323 footprint compatibility with space-constrained mobile and automotive power stages.
Technical Context
This Schottky diode employs a planar metal-semiconductor junction optimized for minimal forward conduction loss and suppressed minority-carrier storage, enabling fast switching (tRR ≤ 3ns) and negligible reverse recovery charge (QRR ≤ 210pC). Its low RθJA (330°C/W on 1-inch² copper pad) supports sustained operation at IF = 0.52A without derating up to +85°C ambient.
The device is characterized across temperature: VF rises only ~40mV from 25°C to 100°C at 400mA, while IR increases to 370µA at +85°C - confirming stable efficiency in thermally demanding motor control and charging circuits where thermal runaway must be avoided.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 40 V - Maximum blocking capability in flyback or freewheeling paths without breakdown |
| IF (Continuous Forward Current) | 0.52 A - Sustained conduction rating enabling use in 500mA-class DC-DC output rectification |
| VF Max @ 400mA | 0.5 V - Low conduction loss reduces power dissipation to ≤200mW at typical operating point |
| IR Max @ 30V | 10 µA - Minimal leakage preserves battery standby time in always-on charging circuits |
| tRR (Reverse Recovery Time) | 3 ns - Enables >1MHz switching frequencies with negligible switching loss in synchronous buck topologies |
| TJ (Junction Temperature) | +150 °C - Allows placement near hot components (e.g., MOSFETs, inductors) without thermal derating |
| Package | SOD323 - 1.3mm × 1.7mm footprint with 0.3mm lead pitch, compatible with standard 0201 reflow profiles |
Pinout & Package
Package: SOD323 - surface-mount plastic case, 2-terminal anode/cathode configuration, matte tin-plated alloy 42 leadframe, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward current entry point | Connected to lower-potential node (e.g., switch node in buck converter); polarity-sensitive for correct rectification |
| Cathode (K) | Forward current exit / reverse blocking terminal | Connected to output rail or ground return; carries full load current and blocks reverse voltage up to 40V |
Key Features
| Feature | Design Value |
|---|---|
| Low VF at high current | 0.445–0.5V @ 400mA - cuts conduction loss by ≥35% vs. standard silicon diodes in 5V/3.3V buck outputs |
| Ultra-low IR at 30V | ≤10µA @ 25°C, ≤370µA @ 85°C - maintains <0.1% standby current drain in battery-backed systems |
| Thermal rating | Junction-to-ambient RθJA = 330°C/W on 1″² copper - enables 0.52A operation without heatsink at +85°C ambient |
| Fast switching | tRR ≤ 3ns, QRR ≤ 210pC - eliminates snubber networks and reduces EMI in MHz-range SMPS designs |
| Green compliance | Halogen- and antimony-free, RoHS 3 compliant - meets IPC-1752A material declaration requirements for automotive Tier-1 BOMs |
Applications
| DC-DC Converters | Mobile Telecoms |
|---|---|
Use Scenario: Output rectification in 1–3MHz buck converters powering baseband processors and RF transceivers. IC Role / Device Role: Freewheeling diode providing low-loss current path during high-side FET off-time. Use Value: 0.5V VF minimizes I²R loss at 400mA, improving efficiency by 2–3% over standard Schottkys and extending battery runtime. | Use Scenario: Reverse-polarity protection and USB OTG power-path management in smartphones and wearables. IC Role / Device Role: Unidirectional current gate preventing backfeed from battery to USB port during charging. Use Value: 10µA IR at 30V ensures <1µA standby leakage, preserving battery charge over multi-week idle periods. |
| Charging Circuits | Motor Controls |
Use Scenario: OR-ing diode in dual-input (USB + adapter) Li-ion charging paths with automatic source selection. IC Role / Device Role: Isolation diode preventing cross-conduction between input sources while minimizing voltage drop. Use Value: 0.45V typical VF at 250mA reduces input-to-battery voltage loss to <50mV, enabling accurate CC/CV regulation. | Use Scenario: Flyback protection in 12V BLDC motor gate-drive supplies and H-bridge bootstrap circuits. IC Role / Device Role: Clamp diode absorbing inductive kickback energy during PWM commutation. Use Value: 3ns tRR and 12A IFSM support 20kHz+ PWM without oscillation or thermal stress in compact motor modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZHCS400TA | Lower VF (0.33V typ @ 400mA), but rated only to +125°C TJ and 30V VR | Better for low-temp, low-voltage apps (e.g., 3.3V LDO bypass); unsuitable for 40V bus or >125°C environments | Select ZHCS400TA only when VR ≤ 30V and peak ambient < +105°C; otherwise ZLLS400TC provides wider voltage/temp margin |
| SBM140T1G | Same 40V/0.5A rating, but VF = 0.55V min @ 400mA and IR = 50µA @ 30V - higher conduction loss and leakage | Acceptable for cost-sensitive industrial controls where 5% efficiency loss and higher standby drain are tolerable | Choose SBM140T1G only if ZLLS400TC supply constraints exist; verify thermal margin due to 20% higher VF and 5× IR |
Compared with ZHCS400TA and SBM140T1G, ZLLS400TC delivers superior thermal resilience (+150°C vs. +125°C/+150°C), tighter leakage control (10µA vs. N/A/50µA), and lower VF consistency across temperature - making it the preferred choice for automotive-adjacent and high-reliability portable power designs.
Availability
ZLLS400TC is available at Aetrix Electronics and suitable for DC-DC converters, mobile telecoms power management, and motor control circuits requiring stable component supply, long-term lifecycle assurance, and RoHS 3-compliant sourcing.
Supply support for ZLLS400TC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-efficiency power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
ZLLS400TC belongs to the ZLLS series of high-temperature Schottky diodes engineered specifically for reliable operation in compact, thermally dense power conversion systems - including automotive body electronics, portable chargers, and fanless industrial SMPS.
FAQ
What is the maximum continuous forward current rating for ZLLS400TC, and under what thermal conditions is it valid?
The ZLLS400TC is rated for 0.52A continuous forward current at TA = +25°C with no derating. When mounted on a 1-inch² copper pad (2oz), it sustains this current up to +85°C ambient without exceeding its +150°C junction limit, thanks to RθJA = 330°C/W. Derating begins above +85°C ambient per the thermal curve in DS33226 Rev. 10-2, page 2.
How does ZLLS400TC's reverse leakage compare to standard Schottky diodes at elevated temperatures?
ZLLS400TC specifies IR ≤ 10µA at VR = 30V and TA = +25°C, rising to ≤370µA at +85°C. This is 3–5× lower than typical industry-standard Schottkys (e.g., SBM140T1G: 50µA @ 25°C, >1mA @ 85°C), directly enabling longer battery shelf life and reduced standby power in always-on systems.
Is ZLLS400TC pin-compatible with ZHCS400TA, and can they be interchanged on the same PCB?
Yes - both use identical SOD323 package dimensions, pad layout, and anode/cathode terminal orientation (top-view marking "40" denotes cathode bar). However, ZHCS400TA has lower VR (30V) and TJ (125°C), so interchange is only safe in designs with ≤30V reverse bias and peak ambient ≤ +105°C; ZLLS400TC offers broader margin in all conditions.
Does ZLLS400TC meet automotive qualification standards, and what is the qualified variant?
ZLLS400TC itself is not AEC-Q200 qualified. The automotive-grade variant is ZLLS400Q, which shares identical electrical specs and SOD323 package but undergoes extended temperature cycling, HTOL, and humidity testing per AEC-Q200 Rev. D. ZLLS400Q is documented in a separate datasheet (DS33226Q) and carries automotive-specific part markings and traceability.
ZLLS400TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 520mA
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 400 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 3 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 30 V
- Capacitance @ Vr, F:
- 15pF @ 30V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
- Operating Temperature - Junction:
- 150°C (Max)
ZLLS400TC FAQ
1.How can I place an order for ZLLS400TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLLS400TC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ZLLS400TC reliable?
The price and inventory of ZLLS400TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLLS400TC is usually 5 days.
3.What payment methods are accepted for ZLLS400TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLLS400TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLLS400TC?
ZLLS400TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLLS400TC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ZLLS400TC?
For technical support, including ZLLS400TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLLS400TC requirements.
6.How does Aetrix verify that ZLLS400TC is sourced from the original manufacturer or authorized distributors?
All ZLLS400TC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZLLS400TC meets industry standards.
7.What is the process for return or replacement of ZLLS400TC?
All ZLLS400TC units undergo pre-shipment inspection (PSI). If there is an issue with ZLLS400TC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ZLLS400TC part is unused and in its original packaging.
Return procedure for ZLLS400TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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Diodes Incorporated
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